Music starts at 8 p.m. Admission costs $12 for the BYOB dance and includes a buffet menu of chicken molé, green chicken enchiladas and menudo at midnight.

But the gig begs for a “Brady Bunch”-style theme song to sort out the relationships.

It's definitely the story of a young man named Bobby Lee who wanted his dad (and namesake) to play at his birthday. The younger Esquivel helps run Pueblo Hall, which caters to an older audience.

It gets a little complicated after that (speaking as someone who knows the territory).

His parents are divorced and don't really talk. No biggie except that Mom, Mary Jane Parrilla, owns the venue and normally wouldn't book the Liberty Band. She's now married to Henry Lee Parrilla, a singer and keyboardist whose oldies band is the house band.

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“It's sort of tough,” said Mary Jane. “People will come out just to see what's going on.”

Bobby Lee Esquivel envisions an oldies-styled battle of the bands. Mary Jane is happy to abide with her son's birthday wishes. She's also happy to keep referring to his dad as Mr. Esquivel.

Henry Lee, who as a teenager in the early 1960s fronted Little Henry & the Laveers, is cool with Friday's bill. For his part, he has hired a five-man horn section to match Liberty Band's brass power “as a surprise,” said Mary Jane.

“It's a great idea for a reality show, isn't it?” she said. “It would be something interesting.”

Bobby Esquivel — the aforementioned “Mr. Esquivel” — says he's happy to do it for his only son.

“He's the one running the place now and it's his birthday. So I'm just going to play it for him,” said the Liberty Band leader. Liberty Band plays its variety set from 8-10 p.m.

“We're very close. But it's kinda hard.”

No doubt, this will be an epic night of music from both men, inadvertent rivals whose West Side musical roots run even deeper than the bad blood or “family fiascos.”